[4] The Smith family holds over 30% of the total shares outstanding but has over 80% of the voting power[5] because of a dual-class structure with Super-voting stock.

[11] In 2001, Sonic made its entrance into the Oklahoma City market with the purchase of Boyd Chevrolet and Steve Bailey Honda.

[13] In July 2003, Sonic agreed to purchase eighteen dealerships, including the Momentum Automotive Group in Houston, Texas.

[15] Sonic halted its acquisition strategy during the Great Recession but returned to acquiring new locations in order to drive growth in 2013.

The trade came about as a way for the brand to acquire a strong-performing Chevrolet franchise, as well as a plot of land beside the dealership on which the new Murray Imports BMW location could be built.

[19] In October 2017, Sonic sold its Capitol Chevrolet & Hyundai franchise in Columbia, SC to the Stivers Automotive Group.

In May 2018, Sonic sold its Lone Star Ford franchise in Houston, TX to the Doggett Auto Group.